Spiral steel pipe processing technology

- Feb 11, 2019-

Spiral steel tube is a kind of spiral welded steel tube which is made of strip steel coil as raw material, often formed by warm extrusion, and welded by automatic double wire and double submerged arc welding process.

The following is a brief introduction of the manufacturing process of spiral steel tube:The raw materials are strip coil, wire and flux.Before being put into operation, it must pass strict physical and chemical inspection.Single wire or double wire submerged arc welding shall be adopted for the butt joint of strip head and tail, and automatic submerged arc welding shall be adopted after the steel pipe is rolled.Before forming, the strip is straightened, cut and planed, and the surface is cleaned, transported and bent.The electric contact pressure gauge is used to control the pressure of pressing down the oil cylinder on both sides of the conveyor to ensure the smooth conveying of the steel strip.Adopt external control or internal control roller forming.The weld gap control device is used to ensure that the weld gap meets the welding requirements.

Lincoln welder is used for single wire or double wire submerged arc welding, so as to obtain stable welding quality.The finished welds are checked by the continuous ultrasonic automatic flaw detector online, which ensures 100% coverage of the spiral welds in nondestructive testing.If there are defects, automatic alarm and spray mark, production workers according to this at any time to adjust the process parameters, eliminate defects in time.Air plasma cutting machine is used to cut the steel pipe into single root.After cutting into single steel tubes, each batch of steel tubes shall be subject to a strict first-inspection system to check the mechanical properties, chemical composition, melting state, surface quality of steel tubes and nondestructive inspection to ensure that the pipe making process is qualified before it can be formally put into production.The part marked by continuous acoustic wave inspection on the weld shall be subject to manual ultrasonic inspection and X-ray reexamination. If there is any defect, it shall be subject to nondestructive inspection again after repair until it is confirmed that the defect has been eliminated.The pipe where the butt weld of the strip and the t-joint intersecting the spiral weld are located shall be inspected by X-ray television or film.Each steel tube through hydrostatic test, pressure using radial seal.The test pressure and time are strictly controlled by the microcomputer testing device of water pressure of steel tube.Test parameters are automatically printed.The pipe end is machined so that the verticality, bevel Angle and blunt edge can be controlled accurately.

Cangzhou Steel Pipe Group (CSPG) Co., Ltd

Cangzhou Steel Pipe Group (CSPG) Co., Ltd. is a large-sized, key metallurgic enterprise of Hebei Province in North China, whose history dates back to 1994. CSPG currently em/paces six member companies with products varying from SSAW, LSAW, ERW, seamless steel pipes to 3PE pipes, galvanized pipes, casing pipes, etc. A Joint-stock corporation, CSPG occupies an area of 600,000 square meters with a total asset of $530 million.

Specialized in the production of straight welded pipe spiral pipe galvanized pipe 3PE/3PP/FBE/TPEP internal and external epoxy powder internal and external epoxy resin cement mortar two cloth three oil buried pipeline IPN8710 non-toxic drinking water internal and external plastic coated lining plastic and other anti-corrosion pipe fittings for oil and gas pipeline water conservancy projects

Executive standard :DIN30670 DIN30678 CSA Z245 AFNOR nf49-710/711 NACE rp0394/0490 AWWAC 210/C213GB/T9711 API 5L ISO 3183Material: Q235B/Q355BGR A GR B x42-x80 l245-l555


Business scope: 21.3mm-3620mmLSAW submerged arc welded pipe 325-2020mmERW straight welded pipe 6mm-711mmSMLS seamless tube 10-1120mmSSAW spiral steel tube 219-3620mmDemand for quality suppliers and partners

Product Name

SY5036-2000 Spiral steel pipe|SSAW Pipe




 BS EN10217,API 5L,ASTM A53-2007,ASTM A252-1998,GB/T 9711.1-1997,
 GB/T 9711.2-1999,GB/T3901 ASTM A252 GR.1 GR.2 GR.3 .

Outer Diameter (OD)

 219mm - 4064mm


 6-50M Length per piece pipe .

Wall Thickness (WT)

 5mm - 26mm


In bundles, Painting, Beveled edges, plastic caps ends, or as buyer's request.


The pipes are widely used in natural gas, offshore oil piling, petroleum, chemical 


         Spiral steel pipe is a spiral seam steel pipe which is made of steel coiled coil as raw material, which is often heated and extruded, and welded by automatic double wire double-sided submerged arc welding process.


SY5036-2000 Oil spiral steel pipe



SY5036-2000 Oil spiral steel pipe